This is really cool. Do they by chance offer a rate limited rsync access to archive everything? Asking in the event my small community gets cut off during an economic collapse. If so I would also set up a public rsync mirror.
I had a similar desire but wasn't able to find anything through Librivox directly. Not everything is up there (at least when I was checking), but I ended up going through archive.org for a number of big collections using the torrent option. I've been seeding some of those torrents now for years and they get very little traffic so I have no problem keeping them up indefinitely.
Not to be that guy but if your community gets cut off from the Internet in an economic collapse maybe audiobooks of public domain works are not super important